journalctl Tutorial: Priority Levels, --since Filtering & Journal Fields
Learn how to use journalctl like a pro on Linux. This hybrid tutorial explains key systemd journal fields (PRIORITY, _BOOT_ID, _TRANSPORT), walks through the 8 priority levels from emerg (0) to debug (7), and shows how time-based filters like --since and --until define your log query window. Then we jump into a hands-on Linux terminal demo so you can see the commands and their real output.
In this video you'll master:
• What journal fields mean and how to read PRIORITY, _BOOT_ID, and _TRANSPORT
• The 8 priority levels (emerg, alert, crit, err, warning, notice, info, debug) and when to use each
• How --since and --until define a flexible time window for log queries
• Hands-on commands: journalctl -n 5, journalctl -p err, journalctl --since today, journalctl --list-boots, and more
• Combining priority filters (-p) with time filters to narrow down logs fast
• Reading real journal output to troubleshoot Linux services
Who this is for: sysadmins, DevOps engineers, Linux administrators, and IT students who want to get comfortable with log analysis on modern Linux systems using systemd.
Drop a comment below: What's your most-used journalctl filter when troubleshooting production issues?
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#journalctl #systemd #linux #sysadmin #devops #linuxtutorial #logs #logmanagement
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